JP2018525860A - Distributed antenna system and signal transmission method - Google Patents

Abstract

The present invention is related to the field of communications technology and is intended to solve the high and costly construction problems caused by existing solutions where power is supplied to the active mixer at the far end in the DAS. A distributed antenna system and a signal transmission method are disclosed. The DAS provided in the present invention includes a signal source, a first signal generator, a first passive mixer, and a first antenna. The first signal generator is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer by using a passive DAS line. The first passive mixer is configured to receive a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. The first passive mixer is further received having a second radio frequency band by using the first local frequency signal to form a first downlink radio frequency signal having the first radio frequency band. A frequency mixing process is performed on the downlink radio frequency signal and then configured to transmit a first downlink radio frequency signal having a first radio frequency band to the first antenna. The first antenna is configured to transmit a received first downlink radio frequency signal having a first radio frequency band.

Description

  The present application claims priority based on Chinese Patent Application No. 2015103687655.5 filed with the National Intellectual Property Office of the People's Republic of China on June 29, 2015, entitled “Distributed Antenna System and Signal Transmission Method” Which is incorporated herein by reference in its entirety.

  The present invention relates to the field of communication technology, and more particularly to a distributed antenna system and a signal transmission method.

  In order to solve the problem of indoor coverage, a distributed antenna system (abbreviated as DAS) is currently used in buildings in most cities (eg, shopping malls, movie theaters, stadiums, or large office buildings). Is arranged. As the total volume of indoor services continues to increase, many operators need to quickly expand the capacity of existing DAS systems.

  Currently, the system capacity of a DAS system is typically increased by transmitting two or more signals in the DAS system. For example, a frequency conversion process may be performed on a plurality of signals transmitted by a base station to form signals having different frequency bands for transmission to a far-end antenna by using a DAS line. Executed in Demodulation processing for these signals having different frequency bands is performed at the far-end antenna, and the signal is transmitted by using multiple antennas. In this way, multiple signals are transmitted, thereby expanding the capacity of the DAS system.

  For example, FIG. 1 is a schematic diagram of an existing DAS in which two signals are transmitted. As shown in FIG. 1, at the near end, a mixer and duplexer / multiplexer are provided. The mixer is used to perform frequency mixing processing on the original signal, forming a signal S2 that is different from the original signal S1, which is then transmitted to the demultiplexer / multiplexer. . The duplexer / multiplexer combines another original signal and the signal generated after frequency mixing and then transmits the combined signal to the far end by using a DAS line. A duplexer / multiplexer, active mixer, and multiple antennas are provided at the far end. The duplexer / multiplexer receives the signal transmitted by the DAS, and then uses filtering to obtain the original signal S1 and the signal S2 obtained after frequency conversion, and uses the antenna. Transmit the original signal and send signal S2 to the active mixer. The active mixer processes the signal S2 to revert to the original signal S1, and transmits the original signal S1 by using another antenna. Thus, double stream transmission is implemented to increase system capacity.

  However, in existing DAS systems, the mixer provided at the far end is typically an active mixer. The active mixer needs to be powered by using a power supply unit at the near end (as shown in FIG. 1). However, electrical signals cannot be transmitted over a DAS line in an existing DAS. Thus, to transmit an electrical signal, a device on an existing DAS line needs to be adapted (eg, replaced with an active device) such that the power supply device supplies power to the active mixer, or The cable needs to be laid again. However, all passive devices on the DAS line are placed in a special place such as an indoor ceiling, and the power supply unit is located in an equipment room relatively far from the active mixer. Therefore, a method of adapting a device on an existing DAS line (for example, replacing a device with an active device) or laying a cable causes a problem that the construction is difficult and expensive.

  In order to solve the above-mentioned problems, the present invention revolutionizes the existing DAS transmission architecture and provides a high degree of construction difficulty brought about by the existing solutions where power is supplied to the active mixer at the far end in the DAS. A distributed antenna system and a signal transmission method are provided to solve the high cost problem.

  In the embodiments of the present invention, the following technical solutions are used.

  According to a first aspect, an embodiment of the present invention provides a distributed antenna system DAS comprising a near-end signal generation device, a passive DAS line, and a far-end transmission device, the near-end signal generation device comprising: A far-end transmission device having a first passive mixer and a first antenna, the first signal generator generating a first local frequency signal and using a passive DAS line; Is configured to transmit a first local frequency signal to a first passive mixer, the first passive mixer receiving a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. The first passive mixer is further configured to use the first local frequency signal to form a first downlink radio frequency signal having a first radio frequency band, thereby providing a second radio Configured to perform frequency mixing processing on a received downlink radio frequency signal having a wavenumber band and then transmitting a first downlink radio frequency signal having a first radio frequency band to a first antenna; And the first antenna is configured to transmit a received first downlink radio frequency signal having a first radio frequency band.

  In connection with the first aspect, in a first implementation of the first aspect, the near-end signal generation device further comprises a first mixer and a multiplexer, and the far-end transmission device further comprises a duplexer. The first mixer is configured to receive a first downlink radio frequency signal having a first radio frequency band transmitted by the signal source, the first mixer further generated by the first signal generator; Performing a frequency mixing process on the first downlink radio frequency signal by using the first local frequency signal generated, and generating a downlink radio frequency signal having a second radio frequency band generated after frequency mixing. Performing frequency mixing processing on the first downlink radio frequency signal to transmit to the multiplexer or by using a local frequency signal generated by the first mixer, A downlink radio frequency signal having a second radio frequency band generated after combining is configured to be transmitted to the multiplexer, and the first signal generator specifically combines the first local frequency signal. The multiplexer is configured to receive a downlink radio frequency signal having a second radio frequency band and a first local frequency signal and to form a combined downlink radio frequency signal. Combining the received downlink radio frequency signal having the second radio frequency band and the received first local frequency signal and then using a passive DAS line A duplexer is configured to transmit the radio frequency signal to the duplexer, the duplexer receives the combined downlink radio frequency signal, the downlink radio frequency signal having the second radio frequency band, and the first local frequency. A signal included in the received combined downlink radio frequency signal, and then a downlink radio frequency signal having a second radio frequency band, a first local frequency signal, and Is transmitted to the first passive mixer, the first passive mixer receiving the first local frequency signal and the downlink radio frequency signal having the second radio frequency band, specifically, The first passive mixer receives the first local frequency signal and a downlink radio frequency signal having a second radio frequency band transmitted by the duplexer.

  In connection with the first implementation of the first aspect, in the second implementation of the first aspect, the far-end transmission device further comprises a second antenna, and the multiplexer is further transmitted by the signal source, A downlink radio frequency signal received after receiving a second downlink radio frequency signal having a radio frequency band, multiplexing the second downlink radio frequency signal into the combined downlink radio frequency signal, and Is transmitted to the duplexer, the duplexer further obtaining a second downlink radio frequency signal having a first radio frequency band, and then a second downlink having a first radio frequency band The radio frequency signal is configured to be transmitted to the second antenna, and the second antenna is configured to transmit the received second downlink radio frequency signal having the first radio frequency band.

  In connection with the first implementation of the first aspect or the second implementation of the first aspect, in the third implementation of the first aspect, the near-end signal generation device further comprises a second signal generator and a second mixer. The far-end transmission device further includes a second passive mixer and a third antenna, wherein the second signal generator generates a second local frequency signal and transmits the second local frequency signal to the multiplexer. And the second mixer is configured to receive a third downlink radio frequency signal having a first radio frequency band transmitted by the signal source, the second mixer further comprising: Receiving the second local frequency signal transmitted by the signal generator and using the second local frequency signal to form a downlink radio frequency signal having a third radio frequency band; Third downlink with Performing a frequency mixing process on the radio frequency signal and then transmitting a downlink radio frequency signal having a third radio frequency band to the multiplexer, or a downlink radio having a third radio frequency band Performing a frequency mixing process on a third downlink radio frequency signal having a first radio frequency band by using a local frequency signal generated by a second mixer to form a frequency signal; And transmitting the downlink radio frequency signal having the third radio frequency band to the multiplexer, the third radio frequency band and the first radio frequency band do not overlap each other, and the multiplexer further includes: Receiving a downlink radio frequency signal having a third radio frequency band transmitted by the second mixer and a second local frequency signal transmitted by the second signal generator; Downlink radio acquired after combining the received downlink radio frequency signal having the radio frequency band and the received second local frequency signal into the combined downlink radio frequency signal. Configured to transmit a frequency signal to the duplexer, the duplexer further obtaining a downlink radio frequency signal having a third radio frequency band and a second local frequency signal, and then a third radio frequency Configured to transmit a downlink radio frequency signal having a band and a second local frequency signal to a second passive mixer, wherein the second passive mixer has a third downlink radio frequency having a first radio frequency band. A frequency mixing process is performed on the downlink radio frequency signal having the third radio frequency band by using the second local frequency signal to form a signal, and then the first null frequency signal is generated. A third downlink radio frequency signal having a line frequency band is configured to be transmitted to a third antenna, and the third antenna transmits a received third downlink radio frequency signal having a first radio frequency band. Configured as follows.

  According to a second aspect, an embodiment of the present invention provides a distributed antenna system DAS comprising a near-end signal receiving device, a passive DAS line, and a far-end receiving device, the near-end signal receiving device comprising: , A first signal generator and a first mixer, the far-end receiving device has a first passive mixer and a first antenna, and the first signal generator generates a first local frequency signal And the first antenna is configured to transmit the first local frequency signal to the first passive mixer by using a passive DAS line, and the first antenna receives the first uplink radio frequency signal having the first radio frequency band. Receiving and configured to transmit a first uplink radio frequency signal having a first radio frequency band to a first passive mixer, the first passive mixer receiving a first local frequency signal and a second radio Has a frequency band Performing a frequency mixing process on a first uplink radio frequency signal having a first radio frequency band by using the received first local frequency signal to form an uplink radio frequency signal; In addition, an uplink radio frequency signal having a second radio frequency band is configured to be transmitted to the first mixer by using a passive DAS line, and the first mixer is configured to transmit the uplink radio frequency signal having the second radio frequency band. The first mixer is configured to receive a link radio frequency signal, and the first mixer is further generated by a first signal generator to form a first uplink radio frequency signal having a first radio frequency band. Perform frequency mixing on the received uplink radio frequency signal having the second radio frequency band by using the local frequency signal. Next, to transmit a first uplink radio frequency signal having a first radio frequency band to a signal destination, or to form a first uplink radio frequency signal having a first radio frequency band, Performing a frequency mixing process on a received uplink radio frequency signal having a second radio frequency band by using a local frequency signal generated by one mixer; Is configured to transmit a first uplink radio frequency signal having a signal destination.

  In relation to the second aspect, in a first implementation of the second aspect, the far-end receiving device further comprises a second antenna and a first multiplexer, and the near-end signal receiving device further comprises a second duplexer. And the second antenna receives the second uplink radio frequency signal having the first radio frequency band and transmits the second uplink radio frequency signal having the first radio frequency band to the first multiplexer. Specifically, the first passive mixer is configured to transmit an uplink radio frequency signal having a second radio frequency band to the first multiplexer, and the first multiplexer is Receiving a second uplink radio frequency signal having a first radio frequency band transmitted by a second antenna and an uplink radio frequency signal having a second radio frequency band transmitted by a first passive mixer; Combined uplin Performing a combining process on a second uplink radio frequency signal having a first radio frequency band and an uplink radio frequency signal having a second radio frequency band to form a radio frequency signal; , Configured to transmit the combined uplink radio frequency signal to the second duplexer by using a passive DAS line, the first radio frequency band and the second radio frequency band do not overlap each other, The duplexer receives the combined uplink radio frequency signal, obtains a second uplink radio frequency signal having the first radio frequency band, and an uplink radio having the second radio frequency band In order to obtain the frequency signal, the signal in the received combined uplink radio frequency signal is separated, and then the second uplink radio having the first radio frequency band. The frequency signal is transmitted to the signal transmission destination, and the uplink radio frequency signal having the second radio frequency band is configured to be transmitted to the first mixer, and the first mixer is specifically configured to transmit the second demultiplexer. Configured to receive an uplink radio frequency signal having a second radio frequency band transmitted by the receiver.

  In connection with the first implementation of the second aspect or the second implementation of the second aspect, in the second implementation of the second aspect, the near-end signal receiving device further includes a second signal generator and a second multiplexing. And a second mixer, the far-end receiving device further includes a third antenna, a second passive mixer, and a first duplexer, and the second signal generator includes a second antenna A local frequency signal is generated, and the second local frequency signal is configured to be transmitted to the second multiplexer. The first signal generator is specifically configured to transmit the first local frequency signal to the second multiplexer. The second multiplexer is configured to receive the first local frequency signal transmitted by the first signal generator and the second local frequency signal transmitted by the second signal generator; In order to form one combined signal, a combining process is performed on the first local frequency signal and the second local frequency signal, The first duplex signal is transmitted to the first duplexer by using a passive DAS line, wherein the first duplexer receives the first duplex signal and receives the first local frequency signal. And obtaining a second local frequency signal, separating the signals in the first combined signal, then transmitting the first local frequency signal to the first passive mixer, and second A local frequency signal is configured to be transmitted to the second passive mixer, and the first passive mixer is specifically configured to receive the first local frequency signal transmitted by the first duplexer. The third antenna is configured to receive a third uplink radio frequency signal having the first radio frequency band and to transmit the third uplink radio frequency signal having the first radio frequency band to the second passive mixer. And the second passive mixer is driven by the first duplexer Receiving the second local frequency signal transmitted and the third uplink radio frequency signal having the first radio frequency band transmitted by the third antenna, and receiving the uplink radio frequency signal having the third radio frequency band. Performing a frequency mixing process on a third uplink radio frequency signal having a first radio frequency band by using a second local frequency signal to form, and then having a third radio frequency band Configured to transmit an uplink radio frequency signal to the first multiplexer, the third radio frequency band and the second radio frequency band do not overlap each other, and the first multiplexer further includes a second passive mixer An uplink radio frequency signal having a third radio frequency band transmitted by the receiver and combining the uplink radio frequency signal having the third radio frequency band The second duplexer is configured to transmit an uplink radio frequency signal obtained after being multiplexed into the second demultiplexer by multiplexing into the frequency signal and using a passive DAS line, A second mixer configured to obtain an uplink radio frequency signal having a third radio frequency band and then to transmit the uplink radio frequency signal having the third radio frequency band to the second mixer; Is configured to receive an uplink radio frequency signal having a third radio frequency band transmitted by the second duplexer, and the second mixer further includes a third uplink having the first radio frequency band. For an uplink radio frequency signal having a third radio frequency band by using a second local frequency signal generated by a second signal generator to form a radio frequency signal Performing a wave number mixing process and then transmitting the third uplink radio frequency signal having the first radio frequency band to a signal transmission destination or the third uplink radio frequency having the first radio frequency band Performing a frequency mixing process on an uplink radio frequency signal having a third radio frequency band by using the local frequency signal generated by the second mixer to form a signal; A third uplink radio frequency signal having one radio frequency band is configured to be transmitted to the signal transmission destination.

  According to a third aspect, an embodiment of the present invention provides a signal transmission method performed by a distributed antenna system DAS, wherein the DAS includes a near-end signal generation device, a passive DAS line, and a far-end transmission device. The near-end signal generation device comprises a signal source and a first signal generator, the far-end transmission device comprises a first passive mixer and a first antenna, the method comprising: Generating a first local frequency signal and transmitting the first local frequency signal to the first passive mixer by using a passive DAS line; the first passive mixer comprising: a first local frequency signal; and Receiving a downlink radio frequency signal having two radio frequency bands, and a first local mixer for further forming a first downlink radio frequency signal having a first radio frequency band. Is used to perform a frequency mixing process on the received downlink radio frequency signal having the second radio frequency band, and then the first downlink radio frequency signal having the first radio frequency band. Transmitting to the first antenna, and the first antenna transmitting the received first downlink radio frequency signal having the first radio frequency band.

  In connection with the third aspect, in a first implementation of the third aspect, the near-end signal generation device further comprises a first mixer and a multiplexer, and the far-end transmission device further comprises a duplexer. The first signal generator transmits the first local frequency signal to the first passive mixer. Specifically, the first signal generator transmits the first local frequency signal to the multiplexer, Before the step of the first passive mixer receiving a downlink radio frequency signal having a second radio frequency band, wherein the multiplexer transmits a first local frequency signal to the first passive mixer; The method further includes receiving a first downlink radio frequency signal having a first radio frequency band, wherein the first mixer is transmitted by the signal source, and the first mixer is generated by the first signal generator. By using the first local frequency signal generated A frequency mixing process is performed on the radio frequency signal, and a downlink radio frequency signal having a second radio frequency band generated after frequency mixing is transmitted to the multiplexer or generated by the first mixer By using the local frequency signal, the frequency mixing process is performed on the first downlink radio frequency signal, and the downlink radio frequency signal having the second radio frequency band generated after the frequency mixing is transmitted to the multiplexer. Transmitting and receiving a downlink radio frequency signal having a second radio frequency band and a first local frequency signal to form a combined downlink radio frequency signal; A received downlink radio frequency signal having a radio frequency band and a received first local frequency signal are combined and then a passive DAS line is used. Transmitting a combined downlink radio frequency signal to the duplexer, wherein the duplexer receives the combined downlink radio frequency signal and has a second radio frequency band, and Separating a signal included in the received combined downlink radio frequency signal to obtain a first local frequency signal, and then a downlink radio frequency signal having a second radio frequency band; Transmitting a local frequency signal to a first passive mixer, wherein the first passive mixer receives the first local frequency signal and a downlink radio frequency signal having a second radio frequency band. Specifically, the first passive mixer includes receiving a first local frequency signal and a downlink radio frequency signal having a second radio frequency band transmitted by the duplexer.

  In connection with the first implementation of the third aspect, in the second implementation of the third aspect, the far-end transmission device further comprises a second antenna, and the method further includes the multiplexer transmitted by the signal source. Receiving a second downlink radio frequency signal having the first radio frequency band, combining the second downlink radio frequency signal into the combined downlink radio frequency signal, and obtaining the downlink Transmitting a radio frequency signal to the duplexer, wherein the duplexer obtains a second downlink radio frequency signal having a first radio frequency band and then a second downlink having a first radio frequency band. Transmitting a radio frequency signal to a second antenna, and wherein the second antenna transmits a received second downlink radio frequency signal having a first radio frequency band.

  In connection with the first implementation of the third aspect or the second implementation of the third aspect, in the third implementation of the third aspect, the near-end signal generation device further comprises a second signal generator and a second mixer. The far-end transmission device further comprises a second passive mixer and a third antenna, and the method further includes the second signal generator generating a second local frequency signal and combining the second local frequency signal. Transmitting to a waver; receiving a third downlink radio frequency signal having a first radio frequency band transmitted by a signal source, wherein the second mixer is a second signal; Receiving the second local frequency signal transmitted by the generator and using the second local frequency signal to form a downlink radio frequency signal having a third radio frequency band, Having a third downlink radio lap Perform frequency mixing processing on several signals and then transmit a downlink radio frequency signal having a third radio frequency band to a multiplexer or a downlink radio frequency signal having a third radio frequency band To perform a frequency mixing process on a third downlink radio frequency signal having a first radio frequency band by using a local frequency signal generated by a second mixer to form Transmitting a downlink radio frequency signal having a third radio frequency band to a multiplexer, wherein the third radio frequency band and the first radio frequency band do not overlap each other; Receiving a downlink radio frequency signal having a third radio frequency band transmitted by the two mixers and a second local frequency signal transmitted by the second signal generator; A downlink radio frequency signal obtained by combining a received downlink radio frequency signal and a received second local frequency signal into a combined downlink radio frequency signal having a band, and obtained after the combination Transmitting to the duplexer, the duplexer obtains a downlink radio frequency signal having a third radio frequency band and a second local frequency signal, and then a downlink having a third radio frequency band Transmitting the radio frequency signal and the second local frequency signal to the second passive mixer; and the second passive mixer forms a third downlink radio frequency signal having the first radio frequency band. By using the second local frequency signal, frequency mixing processing is performed on the downlink radio frequency signal having the third radio frequency band, and then the third downlink having the first radio frequency band. Transmitting a radio frequency signal to the third antenna and transmitting a received third downlink radio frequency signal having the first radio frequency band.

  According to a fourth aspect, an embodiment of the present invention provides a signal transmission method performed by a distributed antenna system DAS, which comprises a near-end signal receiving device, a passive DAS line, and a far-end receiving device. The near-end signal receiving device has a signal destination, a first signal generator, and a first mixer; the far-end receiving device has a first passive mixer and a first antenna; A first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using a passive DAS line; Receiving a first uplink radio frequency signal having one radio frequency band and transmitting a first uplink radio frequency signal having a first radio frequency band to a first passive mixer; and a first passive mixer, First local frequency signal A first uplink radio frequency signal having a first radio frequency band is received by using the received first local frequency signal to form an uplink radio frequency signal having a second radio frequency band. Transmitting an uplink radio frequency signal having a second radio frequency band to the first mixer by performing frequency mixing processing on the next, and then using a passive DAS line; Receiving an uplink radio frequency signal having a second radio frequency band; and a first mixer generating a first uplink radio frequency signal having a first radio frequency band by a first signal generator. A frequency mixing process is performed on the received uplink radio frequency signal having the second radio frequency band by using the generated first local frequency signal. And then transmitting a first uplink radio frequency signal having a first radio frequency band to a signal destination or forming a first uplink radio frequency signal having a first radio frequency band A frequency mixing process is performed on the received uplink radio frequency signal having the second radio frequency band by using the local frequency signal generated by the first mixer; Transmitting a first uplink radio frequency signal having a radio frequency band to a signal transmission destination.

  In connection with the fourth aspect, in a first implementation of the fourth aspect, the far-end receiving device further comprises a second antenna and a first multiplexer, and the near-end signal receiving device further comprises a second duplexer. The first passive mixer transmits the uplink radio frequency signal having the second radio frequency band to the first mixer, specifically, the first passive mixer transmits the second radio frequency signal. Transmitting an uplink radio frequency signal having a band to a first multiplexer, the method further comprising: a second antenna receiving a second uplink radio frequency signal having a first radio frequency band; Transmitting a second uplink radio frequency signal having one radio frequency band to a first multiplexer; and a second uplink having a first radio frequency band, wherein the first multiplexer is transmitted by a second antenna. Link radio frequency signal and first passive mixer A second uplink radio frequency signal having a first radio frequency band for receiving an uplink radio frequency signal having a second radio frequency band transmitted thereby and forming a combined uplink radio frequency signal , And performing a multiplexing process on the uplink radio frequency signal having the second radio frequency band, and then using the passive DAS line, the combined uplink radio frequency signal to the second demultiplexing The first radio frequency band and the second radio frequency band do not overlap each other, and the second duplexer receives the combined uplink radio frequency signal and Receiving to obtain a second uplink radio frequency signal having a frequency band and to obtain an uplink radio frequency signal having a second radio frequency band; Separating the signals in the combined uplink radio frequency signal, and then transmitting a second uplink radio frequency signal having a first radio frequency band to a signal destination and an uplink having a second radio frequency band Transmitting the radio frequency signal to the first mixer, wherein the first mixer receives the uplink radio frequency signal having the second radio frequency band. , Receiving an uplink radio frequency signal having a second radio frequency band transmitted by the second duplexer.

  In connection with the first implementation of the fourth aspect or the second implementation of the fourth aspect, in the second implementation of the fourth aspect, the near-end signal receiving device further includes a second signal generator and a second multiplexing. And a second mixer, the far-end receiving device further includes a third antenna, a second passive mixer, and a first duplexer, wherein the first signal generator is the first The step of transmitting the local frequency signal specifically includes the step of the first signal generator transmitting the first local frequency signal to the second multiplexer, and the method further includes the step of the second signal generator. Generating a second local frequency signal and transmitting the second local frequency signal to the second multiplexer; and a second local frequency signal transmitted by the first signal generator; A first local frequency for receiving a second local frequency signal transmitted by the second signal generator and forming a first combined signal; Performing a multiplexing process on the signal and the second local frequency signal, and then transmitting the first combined signal to the first demultiplexer by using a passive DAS line; A receiver receives the first combined signal and separates the signal in the first combined signal to acquire the first local frequency signal and to acquire the second local frequency signal; Transmitting a frequency signal to the first passive mixer, transmitting a second local frequency signal to the second passive mixer, and a third antenna receiving a third uplink radio frequency signal having the first radio frequency band Transmitting a third uplink radio frequency signal having a first radio frequency band to the second passive mixer; and a second local frequency signal transmitted by the first duplexer by the second passive mixer; The first radio frequency transmitted by the third antenna A first radio frequency band by receiving a third uplink radio frequency signal having a band and using the second local frequency signal to form an uplink radio frequency signal having a third radio frequency band. Performing a frequency mixing process on the third uplink radio frequency signal having, and then transmitting an uplink radio frequency signal having a third radio frequency band to the first multiplexer, The frequency band and the second radio frequency band do not overlap each other, and the first multiplexer receives the uplink radio frequency signal having the third radio frequency band transmitted by the second passive mixer; An uplink radio frequency signal having three radio frequency bands is multiplexed into the combined uplink radio frequency signal and then combined by using a passive DAS line. Transmitting the obtained uplink radio frequency signal to the second duplexer, wherein the second duplexer obtains the uplink radio frequency signal having the third radio frequency band, and then the third radio frequency Transmitting an uplink radio frequency signal having a band to a second mixer, wherein the second mixer receives an uplink radio frequency signal having a third radio frequency band transmitted by the second duplexer. And the second mixer uses the second local frequency signal generated by the second signal generator to form a third uplink radio frequency signal having the first radio frequency band. A frequency mixing process is performed on an uplink radio frequency signal having three radio frequency bands, and then a third uplink radio frequency signal having a first radio frequency band is transmitted to a signal transmission destination; The uplink radio frequency having the third radio frequency band by using the local frequency signal generated by the second mixer to form a third uplink radio frequency signal having the first radio frequency band Performing a frequency mixing process on the signal and then transmitting a third uplink radio frequency signal having a first radio frequency band to a signal destination.

  From the above, it can be seen that embodiments of the present invention provide a distributed antenna system and a signal transmission method. The distributed antenna system includes a near-end signal generation device, a passive DAS line, and a far-end transmission device. The near-end signal generation device has a first signal generator. The far end transmission device has a first passive mixer and a first antenna. A passive mixer at the far end is used to process the received radio frequency signal. Compared to existing DAS, a passive mixer is provided on the far-end transmission device and the frequency mixing process is performed by using a local frequency signal transmitted to the passive mixer by another device. That is, the mixer does not need to generate a local frequency signal when power is supplied to the mixer, thereby providing an existing solution where power is supplied to the active mixer at the far end in the DAS. Avoid the problem of high construction cost and high cost.

  BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. The accompanying drawings in the following description show only some embodiments of the present invention, and those skilled in the art can further derive other drawings from these accompanying drawings without creative efforts. It is clear.

It is a structural diagram of the existing distributed antenna system DAS.

1 is a structural diagram of a DAS according to an embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

6 is a flowchart of another signal transmission method according to an embodiment of the present invention.

6 is a flowchart of another signal transmission method according to an embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

FIG. 6 is a structural diagram of another DAS according to the embodiment of the present invention.

  The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some but not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

  As a basic idea of the present invention, a passive mixer is provided at the far-end antenna, and the frequency mixing process is performed by using a local frequency signal that is transmitted to the passive mixer by another device. That is, when power is supplied to the mixer, the mixer does not need to generate a local frequency signal, thereby using the near end when the mixer generates a local frequency signal. To avoid the inconvenience of installation, which is caused by the need for the mixer to be powered. A distributed antenna system and a signal transmission method provided in an embodiment of the present invention will be described below.

[Embodiment 1]
FIG. 2 is a structural diagram of a distributed antenna system (abbreviation: DAS) according to an embodiment of the present invention. As shown in FIG. 2, the DAS may comprise a near-end signal generation device 10, a passive DAS line 20, and a far-end transmission device 30. The near-end signal generation device 10 is located at the input end of the passive DAS line 20. The far-end transmission device 30 is located at the output end of the passive DAS line 20. Note that the input and output ends in this embodiment of the present invention are determined with respect to the downlink radio frequency signal transmission direction, and the specific arrangement of the devices is not limited.

  The near-end signal generation device 10 is configured to generate a signal, is located in the equipment room, and performs processing such as frequency mixing or multiplexing on the generated signal and any device that generates the signal. Device. The near-end signal generation device 10 may have a signal source and a first signal generator 101. A signal source can be any device that generates a signal, such as a macro base station, a micro base station, a repeater, a remote radio unit (RRU), a pico base station, or a pico RRU. is there.

  The passive DAS line 20 is configured to transmit a signal generated at the near end to an indoor antenna and to transmit the signal to the user by using the indoor antenna. Passive DAS line 20 may be a line that includes devices such as couplers and power splitters.

  The far end transmission device 30 is configured to transmit signals, may be located at a location such as an indoor ceiling, and may include a first passive mixer 301 and a first antenna 302. The input end of the first antenna 302 is connected to the output end of the first passive mixer 301.

  The first signal generator 101 is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer 301.

  The first passive mixer 301 is configured to receive a first local frequency signal and a downlink radio frequency signal having a second radio frequency band.

  The downlink radio frequency signal having the second radio frequency band is frequency mixed with the first local frequency signal and the first downlink radio frequency signal having the first radio frequency band transmitted by the signal source. It is a signal generated after being performed. The first radio frequency band and the second radio frequency band do not overlap each other.

  The first passive mixer 301 is further received having a second radio frequency band by using the first local frequency signal to form a first downlink radio frequency signal having the first radio frequency band. Configured to perform frequency mixing processing on the downlink radio frequency signal, and then transmit the first downlink radio frequency signal having the first radio frequency band to the first antenna 302.

  The frequency mixing process can be an up-conversion process or a down-conversion process. The up-conversion process adds the frequency band of the first local frequency signal and the second radio frequency band, and moves the frequency band of the downlink radio frequency signal to the first radio frequency band higher than the second radio frequency band. possible. The down-conversion process subtracts the frequency band of the first local frequency signal from the second radio frequency band and moves the frequency band of the downlink radio frequency signal to the first radio frequency band lower than the second radio frequency band. possible.

  For example, if the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [0.850-0.860] GHz, the first passive By using the first local frequency signal F = 1 GHz, the mixer 301 converts the signal having the second radio frequency band F2 = [0.850−0.860] GHz into the frequency band F1 = [1.850-1. 860] may up-convert to GHz.

  When the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [2.050-2.060] GHz, the first passive mixer 301 uses the first local frequency signal F = 0.200 GHz to convert the signal having the second radio frequency band F2 = [2.050−2.060] GHz into the frequency band F1 = [1.850−1. .860] may be downconverted to GHz.

  The first antenna 302 is configured to transmit a received first downlink radio frequency signal having a first radio frequency band.

  Optionally, in this embodiment of the invention, the downlink radio frequency signal obtained after frequency mixing processing at the near end and the local frequency signal are combined together and the first passive by using a passive DAS line. It can be transmitted to the mixer 301. Specifically, as shown in FIG. 3, the near-end signal generation device 10 can include a multiplexer 102 and a first mixer 103, and the far-end transmission device 30 further includes a duplexer 303. Have.

  Specifically, the first signal generator 101 is configured to transmit the first local frequency signal to the multiplexer 102. After the multiplexing process by the multiplexer 102, the combined signal is transmitted to the first passive mixer 301 by using the passive DAS line 20.

  The first mixer 103 is configured to receive a first downlink radio frequency signal having a first radio frequency band transmitted by a signal source.

  The first mixer 103 can be a passive mixer or can be an active mixer. When the first mixer 103 is a passive mixer, the first mixer 103 further uses the first local frequency signal generated by the first signal generator to generate a first downlink radio frequency signal. Performing a frequency mixing process and transmitting a downlink radio frequency signal having a second radio frequency band generated after the frequency mixing to the multiplexer.

  When the first mixer 103 is an active mixer, the first mixer 103 is further frequency mixed with respect to the first downlink radio frequency signal by using the local frequency signal generated by the first mixer. Processing may be performed and a downlink radio frequency signal having a second radio frequency band generated after frequency mixing may be transmitted to the multiplexer.

  In this embodiment of the present invention, the first mixer 103 in the near-end signal generation device is also locally localized because the first mixer 103 can generate a local frequency signal when the first mixer 103 is an active mixer. Note that a frequency signal may be generated and the local frequency signal transmitted to the first passive mixer 301. That is, the first passive mixer 301 can be further configured to receive the local frequency signal generated by the first mixer 103. For the first passive mixer 301, the function of the local frequency signal is the same as that of the first local frequency signal.

  Optionally, the downlink radio frequency signal having the second radio frequency band may be a signal that is relatively suitable for transmission by using a passive DAS line. That is, by using a passive DAS line, the attenuation of the converted downlink radio frequency signal having the second radio frequency band caused when the converted downlink radio frequency signal is transmitted is the passive DAS. Less than the attenuation of the first downlink radio frequency signal caused when the first downlink radio frequency signal is transmitted by using the line. This reduces attenuation during signal transmission and increases the signal transmission distance. For example, S2 is a high-frequency signal and S3 is a converted signal that is more suitable for transmission by using a passive DAS line.

  The multiplexer 102 receives the downlink radio frequency signal having the second radio frequency band and the first local frequency signal, and uses the second radio frequency band to form a combined downlink radio frequency signal. Combining the received downlink radio frequency signal with the received first local frequency signal and then demultiplexing the combined downlink radio frequency signal by using a passive DAS line Configured to send to.

  The demultiplexer 303 receives the combined downlink radio frequency signal and receives the received combined radio frequency signal to obtain a downlink radio frequency signal having the second radio frequency band and the first local frequency signal. Configured to separate a signal included in the downlink radio frequency signal and then transmit the downlink radio frequency signal having the second radio frequency band and the first local frequency signal to the first passive mixer .

  The first passive mixer 301 receives a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. Specifically, the first passive mixer 301 receives a first local frequency signal and a downlink radio frequency signal having a second radio frequency band transmitted by the duplexer.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission to expand the capacity of the DAS system. For example, the downlink radio frequency signal and the converted downlink radio frequency signal can be combined together for transmission. Specifically, as shown in FIG. 3, the far-end transmission device 30 further includes a second antenna 304.

  The multiplexer 102 further receives a second downlink radio frequency signal having a first radio frequency band transmitted by the signal source, and combines the second downlink radio frequency signal with the combined downlink radio frequency signal. And a downlink radio frequency signal acquired after the multiplexing is transmitted to the duplexer.

  The second downlink radio frequency signal may be a signal formed by combining together the first downlink radio frequency signal and the original signal in the combined downlink radio frequency signal.

  The duplexer 303 further acquires a second downlink radio frequency signal having the first radio frequency band, and then transmits the second downlink radio frequency signal having the first radio frequency band to the second antenna. Configured.

  The second antenna 304 is configured to transmit a received second downlink radio frequency signal having a first radio frequency band.

  Thus, two signals having the same frequency band are transmitted by using the DAS system. Compared to existing DAS systems that only support single stream transmission, the system capacity is increased.

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two downlink radio frequency signals having the same frequency band, signals having different frequency bands are formed, and then combined together to form a far end. Sent to. After a plurality of radio frequency signals are acquired at the far end according to the combined signal, a plurality of radio frequency signals are transmitted by using a plurality of antennas. Specifically, as shown in FIG. 4, the near-end signal generation device 10 may further include a second signal generator 104 and a second mixer 105, and the far-end transmission device 30 further includes a second There may be a passive mixer 305 and a third antenna 306.

  The second signal generator 104 is configured to generate a second local frequency signal and transmit the second local frequency signal to the multiplexer 102.

  The second mixer 105 is configured to receive a third downlink radio frequency signal having a first radio frequency band transmitted by the signal source.

  The second mixer 105 further receives the second local frequency signal transmitted by the second signal generator and converts the second local frequency signal to form a downlink radio frequency signal having a third radio frequency band. By using the frequency mixing process on the third downlink radio frequency signal having the first radio frequency band, and then transmitting the downlink radio frequency signal having the third radio frequency band to the multiplexer A third frequency band having a first radio frequency band by using a local frequency signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band. Perform frequency mixing on the downlink radio frequency signal, and then transmit the downlink radio frequency signal having the third radio frequency band to the multiplexer Configured urchin, third radio frequency band and the first radio frequency band do not overlap each other.

  The multiplexer 102 further receives a downlink radio frequency signal having a third radio frequency band transmitted by the second mixer and a second local frequency signal transmitted by the second signal generator, A received downlink radio frequency signal having three radio frequency bands and a received second local frequency signal are combined into a combined downlink radio frequency signal and acquired after the combination. A link radio frequency signal is configured to be transmitted to the duplexer.

  Combining the received downlink radio frequency signal having the third radio frequency band and the received second local frequency signal into the combined downlink radio frequency signal is the third radio frequency. A received downlink radio frequency signal having a band, a received second local frequency signal, and the original signal in the combined downlink radio frequency signal are combined together to provide a combined downlink radio frequency Note that it may be to recreate the signal.

  The duplexer 303 further obtains a downlink radio frequency signal having a third radio frequency band and a second local frequency signal, and then a downlink radio frequency signal having a third radio frequency band; A local frequency signal is configured to be transmitted to the second passive mixer.

  The second passive mixer 305 uses a second local frequency signal to form a third downlink radio frequency signal having a first radio frequency band, thereby providing a downlink radio frequency having a third radio frequency band. A frequency mixing process is performed on the signal, and then a third downlink radio frequency signal having a first radio frequency band is transmitted to the third antenna.

  The third antenna 306 is configured to transmit a received third downlink radio frequency signal having a first radio frequency band.

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  In the communication process, as an inverse process for transmitting the downlink signal, the distributed antenna system can further be used to receive the uplink signal and process the uplink signal. Understand that uplink signal processing can be inverse processing for downlink signal processing, or that there can be some differences between uplink signal processing and downlink signal processing. I want to be. When differences exist, there may be some differences between the module for processing the uplink signal and the module for processing the downlink signal. Specifically, as shown in FIG. 5, the DAS may further comprise a near-end signal receiving device 40, a passive DAS line 20, and a far-end receiving device 50.

  The near-end receiver 40 is located at the output end of the passive DAS line 20. The far-end receiving device 50 is located at the input end of the passive DAS line 20. It should be noted that the input end and the output end are determined with respect to the transmission direction of the uplink radio frequency signal, and the specific arrangement of the devices is not limited.

  The near-end signal receiving device 40 is configured to receive a signal, is located in the equipment room, and performs processing such as frequency mixing or multiplexing on the received signal with any device that receives the signal. Device. The near-end signal receiving device 40 may include a signal transmission destination, a first signal generator 401, and a first mixer 402. The signal destination may be any device that can receive a signal, such as a macro base station, a micro base station, a repeater, a remote radio unit (RRU), a pico base station, or a pico RRU. There is a device.

  The passive DAS line 20 is configured to transmit a signal generated at the near end to an indoor antenna and to transmit the signal to the user by using the indoor antenna. Passive DAS line 20 may be a line that includes devices such as couplers and power splitters.

  The far-end receiving device 50 is configured to receive signals, may be located at a location such as an indoor ceiling, and may have a first passive mixer 501 and a first antenna 502. The output terminal of the first antenna 502 is connected to the input terminal of the first passive mixer 501.

  The first signal generator 401 is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer by using a passive DAS line.

  The first antenna 502 is configured to receive a first uplink radio frequency signal having a first radio frequency band and to transmit a first uplink radio frequency signal having a first radio frequency band to a first passive mixer. Is done.

  The first passive mixer 501 receives the first local frequency signal and uses the received first local frequency signal to form an uplink radio frequency signal having a second radio frequency band. A frequency mixing process is performed on the first uplink radio frequency signal having one radio frequency band, and then the uplink radio frequency signal having the second radio frequency band is converted into the first by using a passive DAS line. It is configured to transmit to the mixer.

  The first mixer 402 is configured to receive an uplink radio frequency signal having a second radio frequency band.

  The first mixer 402 further uses a first local frequency signal generated by the first signal generator to form a first uplink radio frequency signal having a first radio frequency band, thereby providing a second Performing a frequency mixing process on a received uplink radio frequency signal having a radio frequency band, and then transmitting a first uplink radio frequency signal having a first radio frequency band to a signal destination Or received with a second radio frequency band by using a local frequency signal generated by the first mixer to form a first uplink radio frequency signal having a first radio frequency band. Frequency mixing processing is performed on the uplink radio frequency signal, and then the first uplink radio frequency signal having the first radio frequency band is transmitted to the signal transmission destination. Configured to send.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission to expand the capacity of the DAS system. For example, the uplink radio frequency signal and the converted uplink radio frequency signal can be combined together for transmission. Specifically, as shown in FIG. 6, the far-end receiving device 50 further includes a second antenna 503 and a first multiplexer 505, and the near-end signal receiving device 40 further includes a second demultiplexer. 405.

  The second antenna 503 receives the second uplink radio frequency signal having the first radio frequency band and transmits the second uplink radio frequency signal having the first radio frequency band to the first multiplexer 505. Composed.

  Specifically, the first passive mixer 501 is configured to transmit an uplink radio frequency signal having a second radio frequency band to the first multiplexer 505.

  The first multiplexer 505 has a second uplink radio frequency signal having a first radio frequency band transmitted by the second antenna and a second radio frequency band transmitted by the first passive mixer 501. A second radio frequency signal having a first radio frequency band and an uplink radio having a second radio frequency band for receiving the uplink radio frequency signal and forming a combined uplink radio frequency signal; The first radio is configured to transmit a combined uplink radio frequency signal to the second duplexer by performing a multiplexing process on the frequency signal and then using a passive DAS line. The frequency band and the second radio frequency band do not overlap each other.

  The second demultiplexer 405 receives the combined uplink radio frequency signal and receives the combined uplink radio frequency signal to obtain a second uplink radio frequency signal having the first radio frequency band. Separating a signal in the signal, and then transmitting a second uplink radio frequency signal having a first radio frequency band to a signal destination to obtain an uplink radio frequency signal having a second radio frequency band; Next, an uplink radio frequency signal having a second radio frequency band is configured to be transmitted to the first mixer 402.

  The first mixer 402 is specifically configured to receive an uplink radio frequency signal having a second radio frequency band transmitted by the second duplexer.

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two uplink radio frequency signals having the same frequency band, signals having different frequency bands are formed and then combined together to be near-end Is transmitted to the signal transmission destination. Specifically, as illustrated in FIG. 7, the near-end signal receiving device further includes a second signal generator 404, a second multiplexer 406, and a second mixer 403, The device further includes a third antenna 507, a second passive mixer 503, and a first duplexer 506506.

  The second signal generator 404 is configured to generate a second local frequency signal and transmit the second local frequency signal to the second multiplexer 406.

  Specifically, the first signal generator 401 is configured to transmit the first local frequency signal to the second multiplexer 406.

  The second multiplexer 406 receives the first local frequency signal transmitted by the first signal generator 401 and the second local frequency signal transmitted by the second signal generator 404, and receives the first combined signal. To perform a multiplexing process on the first local frequency signal and the second local frequency signal, and then using a passive DAS line to convert the first multiplexed signal to the first demultiplexer Configured to transmit to 506506.

  The first demultiplexer 506506 receives the first combined signal and separates the signal in the first combined signal to acquire the first local frequency signal and to acquire the second local frequency signal The first local frequency signal is transmitted to the first passive mixer 501, and the second local frequency signal is transmitted to the second passive mixer 503.

  The first passive mixer 501 is specifically configured to receive the first local frequency signal transmitted by the first duplexer 506506.

  The third antenna 507 receives the third uplink radio frequency signal having the first radio frequency band and transmits the third uplink radio frequency signal having the first radio frequency band to the second passive mixer 503. Composed.

  The second passive mixer 503 receives the second local frequency signal transmitted by the first demultiplexer 506506 and the third uplink radio frequency signal having the first radio frequency band transmitted by the third antenna 507. Frequency mixing for the third uplink radio frequency signal having the first radio frequency band by using the second local frequency signal to receive and form an uplink radio frequency signal having the third radio frequency band Configured to transmit an uplink radio frequency signal having a third radio frequency band to the first multiplexer 505, and the third radio frequency band and the second radio frequency band do not overlap each other. .

  The first multiplexer 505 further receives the uplink radio frequency signal having the third radio frequency band transmitted by the second passive mixer 503, and combines the uplink radio frequency signal having the third radio frequency band. The uplink radio frequency signal obtained after multiplexing is configured to be transmitted to the second duplexer by multiplexing into the waved uplink radio frequency signal and using a passive DAS line.

  The second demultiplexer 405 further acquires an uplink radio frequency signal having a third radio frequency band, and then transmits the uplink radio frequency signal having the third radio frequency band to the second mixer 403. Configured.

  The second mixer 403 is configured to receive an uplink radio frequency signal having a third radio frequency band transmitted by the second duplexer.

  The second mixer 403 further uses the second local frequency signal generated by the second signal generator 404 to form a third uplink radio frequency signal having the first radio frequency band, thereby Performing a frequency mixing process on an uplink radio frequency signal having three radio frequency bands and then transmitting a third uplink radio frequency signal having a first radio frequency band to a signal destination, or Uplink radio frequency signal having the third radio frequency band by using the local frequency signal generated by the second mixer 403 to form a third uplink radio frequency signal having the first radio frequency band A frequency mixing process is then performed, and then a third uplink radio frequency signal having the first radio frequency band is transmitted to the signal destination Sea urchin made.

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  It should be noted that the distributed antenna system DAS provided in this embodiment of the present invention can be applied to a wireless communication network. A wireless communication network may include a DAS and may further include user equipment that is served by a passive DAS. In addition, the numbers such as “first”, “second”, “third”, and “fourth” in this embodiment of the present application are for clear explanation or only for distinction, It does not indicate the superiority or inferiority of the solution.

  From the above, it can be seen that this embodiment of the present invention provides a distributed antenna system comprising a near-end signal generation device, a passive DAS line, and a far-end transmission device. The near-end signal generation device has a signal source and a first signal generator, and the far-end transmission device has a first passive mixer and a first antenna. The first signal generator is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer by using a passive DAS line. The first passive mixer is configured to receive a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. The first passive mixer is further received having a second radio frequency band by using the first local frequency signal to form a first downlink radio frequency signal having the first radio frequency band. A frequency mixing process is performed on the downlink radio frequency signal and then configured to transmit a first downlink radio frequency signal having a first radio frequency band to the first antenna. The first antenna is configured to transmit a received first downlink radio frequency signal having a first radio frequency band. Compared to existing DAS, a passive mixer is provided on the far-end transmission device and the frequency mixing process is performed by using a local frequency signal transmitted to the passive mixer by another device. That is, the mixer does not need to generate a local frequency signal when power is supplied to the mixer, thereby providing an existing solution where power is supplied to the active mixer at the far end in the DAS. Avoid the problem of high construction cost and high cost.

[Embodiment 2]
FIG. 8 shows a signal transmission method according to an embodiment of the present invention. The signal transmission method is executed by the DAS described in the first embodiment. The DAS includes a near-end signal generation device, a passive DAS line, and a far-end transmission device. The near-end signal generation device has a signal source and a first signal generator, and the far-end transmission device has a first passive mixer and a first antenna. As shown in FIG. 8, the method may include the following steps.

  Step 101: The first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using a passive DAS line.

  Step 102: The first passive mixer receives a first local frequency signal and a downlink radio frequency signal having a second radio frequency band.

  The downlink radio frequency signal having the second radio frequency band is frequency mixed with the first local frequency signal and the first downlink radio frequency signal having the first radio frequency band transmitted by the signal source. It is a signal generated after being performed. The first radio frequency band and the second radio frequency band do not overlap each other.

  Optionally, the downlink radio frequency signal having the second radio frequency band may be a signal that is relatively suitable for transmission by using a passive DAS line. That is, the attenuation of the downlink radio frequency signal having the second radio frequency band, which is caused when the downlink radio frequency signal is transmitted by using the passive DAS line, is the first by using the passive DAS line. Less than the attenuation of the first downlink radio frequency signal caused when the downlink radio frequency signal is transmitted. This reduces attenuation during signal transmission and increases the signal transmission distance.

  Step 103: The first passive mixer further has a second radio frequency band by using the first local frequency signal to form a first downlink radio frequency signal having the first radio frequency band. A frequency mixing process is performed on the received downlink radio frequency signal, and then a first downlink radio frequency signal having a first radio frequency band is transmitted to the first antenna.

  The frequency mixing process can be an up-conversion process or a down-conversion process. The up-conversion process adds the frequency band of the first local frequency signal and the second radio frequency band, and moves the frequency band of the downlink radio frequency signal to the first radio frequency band higher than the second radio frequency band. possible. The down-conversion process subtracts the frequency band of the first local frequency signal from the second radio frequency band and moves the frequency band of the downlink radio frequency signal to the first radio frequency band lower than the second radio frequency band. possible.

  For example, if the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [0.850-0.860] GHz, the first passive By using the first local frequency signal F = 1 GHz, the mixer 301 converts the signal having the second radio frequency band F2 = [0.850−0.860] GHz into the frequency band F1 = [1.850-1. 860] may up-convert to GHz.

  When the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [2.050-2.060] GHz, the first passive mixer 301 uses the first local frequency signal F = 0.200 GHz to convert the signal having the second radio frequency band F2 = [2.050−2.060] GHz into the frequency band F1 = [1.850−1. .860] may be downconverted to GHz.

  Step 104: The first antenna transmits a received first downlink radio frequency signal having a first radio frequency band.

  Optionally, in this embodiment of the invention, the downlink radio frequency signal obtained after frequency mixing processing at the near end and the local frequency signal are combined together and the first passive by using a passive DAS line. Can be transmitted to the mixer. Specifically, the near-end signal generation device can include a first mixer and a multiplexer, and the far-end transmission device further includes a duplexer.

  Specifically, the first signal generator transmits the first local frequency signal to the first passive mixer. Specifically, the first signal generator transmits the first local frequency signal to the multiplexer and combines the signals. Before the first passive mixer receives a downlink radio frequency signal having a second radio frequency band, the method comprising: transmitting a first local frequency signal to the first passive mixer; Further, the first mixer receives a first downlink radio frequency signal having a first radio frequency band transmitted by the signal source, and the first mixer is generated by the first signal generator. A frequency mixing process is performed on the first downlink radio frequency signal by using the first local frequency signal, and a downlink radio frequency signal having a second radio frequency band generated after the frequency mixing is combined. Or send to A downlink having a second radio frequency band, which is generated after frequency mixing by performing a frequency mixing process on the first downlink radio frequency signal by using a local frequency signal generated by the first mixer Transmitting the radio frequency signal to the multiplexer; the multiplexer receives the downlink radio frequency signal having the second radio frequency band and the first local frequency signal; and the combined downlink radio frequency signal. By combining the received downlink radio frequency signal having the second radio frequency band and the received first local frequency signal, and then using a passive DAS line, Transmitting the combined downlink radio frequency signal to the duplexer, the duplexer receiving the combined downlink radio frequency signal and having a second radio frequency band; In order to obtain the downlink radio frequency signal and the first local frequency signal, the signal included in the received combined downlink radio frequency signal is separated, and then the downlink having the second radio frequency band Transmitting a radio frequency signal and a first local frequency signal to a first passive mixer, wherein the first passive mixer has a first local frequency signal and a second radio frequency band. Specifically, the step of receiving the frequency signal includes: a first local frequency signal transmitted by the duplexer; and a downlink radio frequency signal having a second radio frequency band. Receiving.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission. For example, the downlink radio frequency signal and the converted downlink radio frequency signal can be combined together for transmission. Specifically, the far end transmission device may further include a second antenna. The method further includes a multiplexer receiving a second downlink radio frequency signal having a first radio frequency band transmitted by the signal source, and combining the second downlink radio frequency signal with the combined downlink radio frequency signal. And transmitting the downlink radio frequency signal acquired after the multiplexing to the duplexer, and the duplexer acquires the second downlink radio frequency signal having the first radio frequency band. Next, transmitting a second downlink radio frequency signal having a first radio frequency band to a second antenna, and a received second downlink radio frequency having a second radio frequency band Transmitting a signal.

  The step of combining the first downlink radio frequency signal into the combined downlink radio frequency signal to form a second combined downlink radio frequency signal is the second combined downlink radio frequency signal. Combining the first downlink radio frequency signal and the original signal together into the combined downlink radio frequency signal may be included to re-form the radio frequency signal.

  Thus, two signals having the same frequency band are transmitted by using the DAS system. Compared to existing DAS systems that only support single stream transmission, the system capacity is increased.

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two downlink radio frequency signals having the same frequency band, signals having different frequency bands are formed, and then combined together to form a far end. Sent to. After a plurality of radio frequency signals are acquired at the far end according to the combined signal, a plurality of radio frequency signals are transmitted by using a plurality of antennas. Specifically, the near-end signal generation device can further include a second signal generator and a second mixer, and the far-end transmission device can further include a second passive mixer and a third antenna. The method further includes: a second signal generator generating a second local frequency signal; transmitting the second local frequency signal to the multiplexer; and a second mixer transmitted by the signal source. Receiving a third downlink radio frequency signal having a radio frequency band; and a second mixer receiving a second local frequency signal transmitted by the second signal generator and having a third radio frequency band. A frequency mixing process is performed on the third downlink radio frequency signal having the first radio frequency band by using the second local frequency signal to form a link radio frequency signal, and then a third Generated by the second mixer to transmit a downlink radio frequency signal having a radio frequency band to a multiplexer or to form a downlink radio frequency signal having a third radio frequency band By using the local frequency signal, a frequency mixing process is performed on the third downlink radio frequency signal having the first radio frequency band, and then the downlink radio frequency signal having the third radio frequency band is combined. A third radio frequency band, wherein the third radio frequency band and the first radio frequency band do not overlap each other, and the multiplexer transmits the third radio frequency band transmitted by the second mixer. A received downlink radio frequency signal having a third radio frequency band, and a received second radio frequency signal received by the second radio frequency signal transmitted by the second signal generator; Combining the local frequency signal with the combined downlink radio frequency signal and transmitting the downlink radio frequency signal acquired after the multiplexing to the duplexer; A downlink radio frequency signal having a frequency band and a second local frequency signal are acquired, and then the downlink radio frequency signal having a third radio frequency band and the second local frequency signal are sent to the second passive mixer. Transmitting, and the second passive mixer has a third radio frequency band by using the second local frequency signal to form a third downlink radio frequency signal having the first radio frequency band. Performing a frequency mixing process on the downlink radio frequency signal, then transmitting a third downlink radio frequency signal having a first radio frequency band to the third antenna; and Transmitting a received third downlink radio frequency signal having a frequency band, wherein at least one of the third antennas has a first radio frequency band. Transmitting the transmitted downlink radio frequency signal.

  To form a third combined downlink radio frequency signal, the received downlink radio frequency signal having the third radio frequency band and the received second local frequency signal are combined into the combined downlink. Combining into the radio frequency signal means that the received downlink radio frequency signal having the third radio frequency band, the received second local frequency signal, and the original in the combined downlink radio frequency signal. May be combined together to re-form the combined downlink radio frequency signal.

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  In the communication process, as an inverse process for transmitting the downlink signal, the distributed antenna system can further be used to receive the uplink signal and process the uplink signal. Understand that uplink signal processing can be inverse processing for downlink signal processing, or that there can be some differences between uplink signal processing and downlink signal processing. I want to be. For example, FIG. 9 shows another signal transmission method according to an embodiment of the present invention. The signal transmission method is performed by the distributed antenna system DAS. The DAS includes a near end signal receiving device, a passive DAS line, and a far end receiving device. The near-end signal receiving device has a signal destination, a first signal generator, and a first mixer, and the far-end receiving device has a first passive mixer and a first antenna. As shown in FIG. 9, the method may include the following steps.

  Step 201: The first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using a passive DAS line.

  Step 202: A first antenna receives a first uplink radio frequency signal having a first radio frequency band and transmits a first uplink radio frequency signal having a first radio frequency band to a first passive mixer.

  Step 203: A first passive mixer receives a first local frequency signal and uses the received first local frequency signal to form an uplink radio frequency signal having a second radio frequency band. Performing the frequency mixing process on the first uplink radio frequency signal having the first radio frequency band and then using the passive DAS line to convert the uplink radio frequency signal having the second radio frequency band to Transmit to the first mixer.

  Step 204: A first signal generator for receiving an uplink radio frequency signal having a second radio frequency band and forming a first uplink radio frequency signal having a first radio frequency band by a first mixer. A frequency mixing process is performed on the received uplink radio frequency signal having the second radio frequency band by using the first local frequency signal generated by A local frequency signal generated by the first mixer to transmit a first uplink radio frequency signal having to a signal destination or to form a first uplink radio frequency signal having a first radio frequency band The first mixer performs a frequency mixing process on the received uplink radio frequency signal having the second radio frequency band; A, and it transmits the first uplink radio frequency signal having a first radio frequency band to a signal destination.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission to expand the capacity of the DAS system. For example, the uplink radio frequency signal and the converted uplink radio frequency signal can be combined together for transmission. Specifically, the far-end receiving device can further include a second antenna and a first multiplexer, and the near-end signal receiving device can further include a second duplexer.

  The step of the first passive mixer transmitting the uplink radio frequency signal having the second radio frequency band to the first mixer is specifically the case where the first passive mixer is the up having the second radio frequency band. Transmitting a link radio frequency signal to the first multiplexer, the method further comprising: a second antenna receiving a second uplink radio frequency signal having the first radio frequency band; and Transmitting a second uplink radio frequency signal having a first radio frequency band having a first radio frequency band transmitted by the second antenna to the first multiplexer. And an uplink radio frequency signal having a second radio frequency band transmitted by the first passive mixer and having a first radio frequency band to form a combined uplink radio frequency signal Two uplink radio frequency signals and an uplink radio frequency signal having a second radio frequency band are combined and then combined with a passive DAS line to generate a combined uplink radio frequency signal. Transmitting a signal to the second duplexer, wherein the first radio frequency band and the second radio frequency band do not overlap each other, and the second duplexer transmits the combined uplink radio frequency signal. Receiving and separating signals in the received combined uplink radio frequency signal, thereby obtaining a second uplink radio frequency signal having the first radio frequency band, and then the first radio frequency band And transmitting a second uplink radio frequency signal having a second radio frequency signal to a signal destination, obtaining an uplink radio frequency signal having a second radio frequency band, and then a second radio frequency signal. Transmitting an uplink radio frequency signal having a band to a first mixer, wherein the first mixer receives an uplink radio frequency signal having a second radio frequency band, specifically, The first mixer includes receiving an uplink radio frequency signal having a second radio frequency band transmitted by the second duplexer.

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two uplink radio frequency signals having the same frequency band, signals having different frequency bands are formed and then combined together to be near-end Is transmitted to the signal transmission destination. Specifically, the near-end signal receiving device may further include a second signal generator, a second multiplexer, and a second mixer, and the far-end receiving device further includes a third antenna; It may have a second passive mixer and a first duplexer.

  The step of transmitting the first local frequency signal by the first signal generator specifically includes the step of transmitting the first local frequency signal to the second multiplexer by the first signal generator, The second signal generator generates a second local frequency signal and transmits the second local frequency signal to the second multiplexer; and the second multiplexer transmits by the first signal generator. Receiving the first local frequency signal and the second local frequency signal transmitted by the second signal generator to form a first combined signal, the first local frequency signal and the second local frequency signal A first multiplexing signal is transmitted to the first demultiplexer by using a passive DAS line, and the first demultiplexer Receiving the signal and obtaining the first local frequency signal and obtaining the second local frequency signal For this purpose, separating the signal in the first combined signal, transmitting the first local frequency signal to the first passive mixer, transmitting the second local frequency signal to the second passive mixer, and a third antenna Receiving a third uplink radio frequency signal having a first radio frequency band and transmitting the third uplink radio frequency signal having a first radio frequency band to a second passive mixer; and a second passive mixer Receives a second local frequency signal transmitted by the first duplexer and a third uplink radio frequency signal having the first radio frequency band transmitted by the third antenna, and receives a third radio frequency band Performing a frequency mixing process on the third uplink radio frequency signal having the first radio frequency band by using the second local frequency signal to form an uplink radio frequency signal having Next, transmitting an uplink radio frequency signal having a third radio frequency band to the first multiplexer, wherein the third radio frequency band and the second radio frequency band do not overlap each other; A multiplexer receives an uplink radio frequency signal having a third radio frequency band transmitted by a second passive mixer and combines the uplink radio frequency signal having a third radio frequency band with the uplink radio Transmitting the uplink radio frequency signal obtained after multiplexing to the second demultiplexer by multiplexing into the frequency signal and using a passive DAS line, and the second demultiplexer comprising: Obtaining an uplink radio frequency signal having three radio frequency bands, and then transmitting an uplink radio frequency signal having a third radio frequency band to a second mixer; Waver Receiving an uplink radio frequency signal having a third radio frequency band transmitted by the second mixer, wherein the second mixer forms a third uplink radio frequency signal having the first radio frequency band. Performing a frequency mixing process on an uplink radio frequency signal having a third radio frequency band by using a second local frequency signal generated by a two-signal generator; A local frequency signal generated by the second mixer to transmit a third uplink radio frequency signal having to a signal destination or to form a third uplink radio frequency signal having a first radio frequency band Is used to perform frequency mixing processing on the uplink radio frequency signal having the third radio frequency band, and then to the first radio frequency band And a step of transmitting a third uplink radio frequency signals having the signal destination.

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  It should be noted that the distributed antenna system DAS provided in this embodiment of the present invention can be applied to a wireless communication network. A wireless communication network may include a DAS and may further include user equipment that is served by a passive DAS. In addition, the numbers such as “first”, “second”, “third”, and “fourth” in this embodiment of the present application are for clear explanation or only for distinction, It does not indicate the superiority or inferiority of the solution.

  From the above, it can be seen that this embodiment of the present invention provides a signal transmission method performed by the distributed antenna system DAS. The DAS includes a near-end signal generation device, a passive DAS line, and a far-end transmission device. The near-end signal generation device has a signal source and a first signal generator, and the far-end transmission device has a first passive mixer and a first antenna. The first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using a passive DAS line. The first passive mixer receives a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. The first passive mixer is further received having a second radio frequency band by using the first local frequency signal to form a first downlink radio frequency signal having the first radio frequency band. Frequency mixing processing is performed on the downlink radio frequency signal, and then the first downlink radio frequency signal having the first radio frequency band is transmitted to the first antenna. The first antenna transmits a received first downlink radio frequency signal having a first radio frequency band. Compared to existing DAS, a passive mixer is provided on the far-end transmission device and the frequency mixing process is performed by using a local frequency signal transmitted to the passive mixer by another device. That is, the mixer does not need to generate a local frequency signal when power is supplied to the mixer, thereby providing an existing solution where power is supplied to the active mixer at the far end in the DAS. Avoid the problem of high construction cost and high cost.

  Embodiment 3 FIG. 10 is a structural diagram of a distributed antenna system DAS according to an embodiment of the present invention, which is used for executing the method described in Embodiment 2. As shown in FIG. 10, the distributed antenna system DAS may include a processor 1001, a communication unit 1002, a transmitter 1003, a memory 1004, and a passive DAS line 1005. Passive DAS line 1005 is configured to implement connectivity and intercommunication between these devices.

  The processor 1001 may be a central processing unit (English name: central processing unit, abbreviated name: CPU).

  The memory 1004 is a volatile memory (English name: volatile memory) such as a random access memory (English name: random-access memory, abbreviated as RAM), or a read-only memory (English name: read-only memory, abbreviated name), for example. : ROM), flash memory (English name: flash memory), hard disk drive (English name: hard disk drive, abbreviated name: HDD), or non-volatile memory such as solid state drive (English name: solid-state drive, SSD) English name: non-volatile memory) or a combination of the above types of memory. Memory 1004 provides instructions and data to processor 1001.

  The communication unit 1002 is configured to receive a first local frequency signal and a downlink radio frequency signal having a second radio frequency band.

  The downlink radio frequency signal having the second radio frequency band is frequency mixed with the first local frequency signal and the first downlink radio frequency signal having the first radio frequency band transmitted by the signal source. It is a signal generated after being performed. The first radio frequency band and the second radio frequency band do not overlap each other.

  Optionally, the downlink radio frequency signal having the second radio frequency band may be a signal that is relatively suitable for transmission by using a passive DAS line. That is, the attenuation of the downlink radio frequency signal having the second radio frequency band, which is caused when the downlink radio frequency signal is transmitted by using the passive DAS line, is the first by using the passive DAS line. Less than the attenuation of the first downlink radio frequency signal caused when the downlink radio frequency signal is transmitted. This reduces attenuation during signal transmission and increases the signal transmission distance.

  The processor 1001 uses the first local frequency signal received by the communication unit 1002 to form a first downlink radio frequency signal having the first radio frequency band, thereby down-converting the second radio frequency band. It is configured to perform frequency mixing processing on the link radio frequency signal. The downlink radio frequency signal having the second radio frequency band is a signal generated after the first local frequency signal and the first downlink radio frequency signal having the first radio frequency band, and the first radio frequency band The second radio frequency band does not overlap each other.

  The frequency mixing process can be an up-conversion process or a down-conversion process. The up-conversion process adds the frequency band of the first local frequency signal and the second radio frequency band, and moves the frequency band of the downlink radio frequency signal to the first radio frequency band higher than the second radio frequency band. possible. The down-conversion process subtracts the frequency band of the first local frequency signal from the second radio frequency band and moves the frequency band of the downlink radio frequency signal to the first radio frequency band lower than the second radio frequency band. possible.

  For example, if the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [0.850-0.860] GHz, the first passive By using the first local frequency signal F = 1 GHz, the mixer 301 converts the signal having the second radio frequency band F2 = [0.850−0.860] GHz into the frequency band F1 = [1.850-1. 860] may up-convert to GHz.

  When the first radio frequency band is F1 = [1.850-1.860] GHz and the second radio frequency band is F2 = [2.050-2.060] GHz, the first passive mixer 301 uses the first local frequency signal F = 0.200 GHz to convert the signal having the second radio frequency band F2 = [2.050−2.060] GHz into the frequency band F1 = [1.850−1. .860] may be downconverted to GHz.

  The transmitter 1003 is configured to transmit a first downlink radio frequency signal having a first radio frequency band.

  Optionally, the communication unit 1002 further receives the first downlink radio frequency signal having the first radio frequency band before the communication unit 1002 receives the downlink radio frequency signal having the second radio frequency band. Composed.

  The processor 1001 is further configured to perform frequency mixing processing on the first downlink radio frequency signal received by the communication unit 1002 to form a downlink radio frequency signal having a second radio frequency band. The

  The communication unit 1002 further includes a received downlink radio frequency signal having a second radio frequency band formed by the processor 1001 and a received first radio frequency signal to form a combined downlink radio frequency signal. It is configured to multiplex the local frequency signal.

  The processor 1001 further separates signals in the combined downlink radio frequency signal formed by the communication unit 1002 to obtain a downlink radio frequency signal having a second radio frequency band and a first local frequency signal. Configured to do.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission. For example, the DAS may multiplex together the downlink radio frequency signal and the converted downlink radio frequency signal for transmission. Specifically, the communication unit 1002 further receives a second downlink radio frequency signal having the first radio frequency band, and combines the second downlink radio frequency signal having the first radio frequency band with the downlink radio that has been combined. It is configured to be multiplexed into the frequency signal.

  The processor 1001 is further configured to obtain a second downlink radio frequency signal having the first radio frequency band from the combined downlink radio frequency signal.

  The transmitter 1003 is further configured to transmit a second downlink radio frequency signal having a first radio frequency band.

  The step of combining the first downlink radio frequency signal into the combined downlink radio frequency signal to form a second combined downlink radio frequency signal is the second combined downlink radio frequency signal. Combining the first downlink radio frequency signal and the original signal together into the combined downlink radio frequency signal may be included to re-form the radio frequency signal.

  Thus, two signals having the same frequency band are transmitted by using the DAS system. Compared to existing DAS systems that only support single stream transmission, the system capacity is increased.

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two downlink radio frequency signals having the same frequency band, signals having different frequency bands are formed, and then combined together to form a far end. Sent to. After a plurality of radio frequency signals are acquired at the far end according to the combined signal, a plurality of radio frequency signals are transmitted by using a plurality of antennas. Specifically, the communication unit 1002 is further configured to receive a second local frequency signal and a third downlink radio frequency signal having a first radio frequency band.

  The processor 1001 further performs frequency mixing on the third downlink radio frequency signal having the first radio frequency band received by the communication unit 1002 to form a downlink radio frequency signal having the third radio frequency band. It is configured to perform processing. Here, the third radio frequency band and the first radio frequency band do not overlap each other.

  The communication unit 1002 is further configured to multiplex the downlink radio frequency signal having the third radio frequency band and the second local frequency signal into the combined downlink radio frequency signal.

  The processor 1001 further obtains a downlink radio frequency signal having a third radio frequency band and a second local frequency signal according to the combined downlink radio frequency signal, and a third downlink having the first radio frequency band. To form a radio frequency signal, the second local frequency signal is used to perform a frequency mixing process on a downlink radio frequency signal having a third radio frequency band.

  The transmitter 1003 is further configured to transmit a third downlink radio frequency signal having a first radio frequency band.

  To form a third combined downlink radio frequency signal, the received downlink radio frequency signal having the third radio frequency band and the received second local frequency signal are combined into the combined downlink. Combining into the radio frequency signal means that the received downlink radio frequency signal having the third radio frequency band, the received second local frequency signal, and the original in the combined downlink radio frequency signal. May be combined together to re-form the combined downlink radio frequency signal.

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  In the communication process, as an inverse process for transmitting the downlink signal, the distributed antenna system can further be used to receive the uplink signal and process the uplink signal. Understand that uplink signal processing can be inverse processing for downlink signal processing, or that there can be some differences between uplink signal processing and downlink signal processing. I want to be. For example, FIG. 11 is a structural diagram of a distributed antenna system DAS according to an embodiment of the present invention, which is used to perform the method described in the second embodiment. As shown in FIG. 11, the distributed antenna system DAS may include a processor 1101, a communication unit 1102, a transmitter 1103, a memory 1104, and a passive DAS line 1105. Passive DAS line 1105 is configured to implement connectivity and intercommunication between these devices.

  The processor 1101 may be a central processing unit (English name: central processing unit, abbreviated name: CPU).

  The memory 1104 is a volatile memory (English name: volatile memory) such as a random access memory (English name: random-access memory, abbreviated as RAM), or a read-only memory (English name: read-only memory, abbreviated name), for example. : ROM), flash memory (English name: flash memory), hard disk drive (English name: hard disk drive, abbreviated name: HDD), or non-volatile memory such as solid state drive (English name: solid-state drive, SSD) English name: non-volatile memory) or a combination of the above types of memory. Memory 1104 provides instructions and data to processor 1101.

  The communication unit 1102 is configured to receive the first local frequency signal and transmit the first local frequency signal to the transmitter 1103.

  Transmitter 1103 receives a first uplink radio frequency signal having a first radio frequency band and uses the first local frequency signal to form an uplink radio frequency signal having a second radio frequency band. Is configured to perform frequency mixing processing on the first uplink radio frequency signal having the first radio frequency band.

  The processor 1101 performs frequency mixing processing on the uplink radio frequency signal having the second radio frequency band formed by the transmitter 1103 to form a first uplink radio frequency signal having the first radio frequency band. Configured to perform.

  Furthermore, the DAS provided in this embodiment of the present invention may further support the same frequency band double stream transmission to expand the capacity of the DAS system. For example, the uplink radio frequency signal and the converted uplink radio frequency signal can be combined together for transmission. Specifically, the transmitter 1103 further has a first radio frequency band to receive a second uplink radio frequency signal having a first radio frequency band and to form a combined uplink radio frequency signal. A combining process is performed on the second uplink radio frequency signal and the uplink radio frequency signal having the second radio frequency band. Here, the first radio frequency band and the second radio frequency band do not overlap each other.

  The processor 1101 is further configured to separate signals in the combined uplink radio frequency signal received by the transmitter 1103 to obtain a second uplink radio frequency signal having the first radio frequency band. .

  Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two uplink radio frequency signals having the same frequency band, signals having different frequency bands are formed and then combined together to be near-end Is transmitted to the signal transmission destination. Specifically, the communication unit 1102 is further configured to receive the second local frequency signal and transmit the second local frequency signal to the transmitter 1103.

  The transmitter 1103 further receives a third uplink radio frequency signal having a first radio frequency band and uses the second local frequency signal to form an uplink radio frequency signal having a third radio frequency band. Accordingly, a frequency mixing process is performed on the third uplink radio frequency signal having the first radio frequency band. Here, the third radio frequency band and the second radio frequency band do not overlap each other.

  The transmitter 1103 is further configured to multiplex the uplink radio frequency signal having the third radio frequency band into the combined uplink radio frequency signal.

  The processor 1101 is further configured to separate signals in the combined uplink radio frequency signal to obtain an uplink radio frequency signal having a third radio frequency band.

  The processor 1101 is further configured to perform a frequency mixing process on the uplink radio frequency signal having the third radio frequency band to form a third uplink radio frequency signal having the first radio frequency band. The

  In the description of the above embodiment of the present invention, an example in which DAS supports the same frequency band double stream processing is used, but more than two (ie, multiple) uplink radio frequencies having the same frequency band. Note that the presence of a signal is not excluded. The processing of more than two uplink radio frequency signals shall also be included in the technical solution described in this embodiment. Accordingly, DAS can simultaneously transmit multiple signals having the same frequency band, thereby greatly increasing the system capacity of DAS.

  It should be noted that the distributed antenna system DAS provided in this embodiment of the present invention can be applied to a wireless communication network. A wireless communication network may include a DAS and may further include user equipment that is served by a passive DAS. In addition, the numbers such as “first”, “second”, “third”, and “fourth” in this embodiment of the present application are for clear explanation or only for distinction, It does not indicate the superiority or inferiority of the solution.

  From the above, it can be seen that this embodiment of the present invention provides a DAS comprising a processor, a communication unit, and a transmitter. The communication unit is configured to receive a first local frequency signal and a downlink radio frequency signal having a second radio frequency band. The processor uses a first local frequency signal received by the communication unit to form a first downlink radio frequency signal having a first radio frequency band, thereby providing a downlink radio having a second radio frequency band. A frequency mixing process is configured to be performed on the frequency signal. The downlink radio frequency signal having the second radio frequency band is a signal generated after frequency mixing is performed on the first local frequency signal and the first downlink radio frequency signal having the first radio frequency band. It is. The first radio frequency band and the second radio frequency band do not overlap each other. The transmitter is configured to transmit a first downlink radio frequency signal having a first radio frequency band. Compared to existing DAS, a passive mixer is provided on the far-end transmission device and the frequency mixing process is performed by using a local frequency signal transmitted to the passive mixer by another device. That is, the mixer does not need to generate a local frequency signal when power is supplied to the mixer, thereby providing an existing solution where power is supplied to the active mixer at the far end in the DAS. Avoid the problem of high construction cost and high cost.

  It should be understood that in the embodiments provided herein, the disclosed systems, devices, and methods can be implemented in other manners. For example, the described device embodiments are merely examples. For example, the unit division is merely a logical function division and may be another division in actual implementation. For example, multiple units or components may be combined or integrated with another system. Or some functions may be ignored or not performed. In addition, the interconnection or direct coupling or communication connection shown or described may be an indirect coupling or communication connection between several interfaces, equipment or units, or an electrical connection, a mechanical connection. Or may be implemented through other forms of connection.

  A unit described as a separate device may or may not be physically separate, and a device displayed as a unit may or may not be a physical unit, It may be located in one place or distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiments.

  In addition, the functional units in embodiments of the present invention may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be one Integrated into the unit. The integration unit may be implemented in the form of hardware, or may be implemented in the form of hardware in addition to the software functional unit.

  Where the integration unit described above is implemented in the form of a software functional unit, the integration unit may be stored on a computer-readable storage medium. The software functional unit is stored in a storage medium and instructs a computer device (which may be a personal computer, server, or network device) to perform some of the method steps described in embodiments of the present invention. Including some instructions to The above storage medium includes a program code such as a USB flash drive, a removable hard disk, a read-only memory (abbreviation: ROM), a random access memory (abbreviation: RAM), a magnetic disk, or an optical disk. Including any medium capable of storing.

  One skilled in the art will appreciate that all or some of the method steps in the embodiments may be implemented by a program that instructs the associated hardware. The program may be stored in a computer readable storage medium. The storage medium may include a read only memory, a random access memory, a magnetic disk, or an optical disk.

  Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present invention and do not limit the present invention. Although the present invention has been described in detail in connection with the above-described embodiments, those skilled in the art will further describe in the above-described embodiments without departing from the scope of the technical solutions of the embodiments of the present invention. It should be understood that changes may be made to the technical solution provided, or equivalent replacements may be made to some technical features of the embodiments described above.

Furthermore, in order to better improve the transmission capacity of the DAS system, the DAS provided in this embodiment of the present invention may further support the transmission of multiple signals having the same radio frequency band. For example, after frequency mixing processing is separately performed on at least two uplink radio frequency signals having the same frequency band, signals having different frequency bands are formed and then combined together to be near-end Is transmitted to the signal transmission destination. Specifically, as illustrated in FIG. 7, the near-end signal receiving device further includes a second signal generator 404, a second multiplexer 406, and a second mixer 403, The device further includes a third antenna 507, a second passive mixer 503, and a first duplexer 506 .

The second multiplexer 406 receives the first local frequency signal transmitted by the first signal generator 401 and the second local frequency signal transmitted by the second signal generator 404, and receives the first combined signal. To perform a multiplexing process on the first local frequency signal and the second local frequency signal, and then using a passive DAS line to convert the first multiplexed signal to the first demultiplexer Configured to transmit to 506 .

The first demultiplexer 506 receives the first combined signal and separates the signal in the first combined signal to acquire the first local frequency signal and to acquire the second local frequency signal. The first local frequency signal is transmitted to the first passive mixer 501, and the second local frequency signal is transmitted to the second passive mixer 503.

The first passive mixer 501 is specifically configured to receive the first local frequency signal transmitted by the first duplexer 506 .

The second passive mixer 503 receives the second local frequency signal transmitted by the first duplexer 506 and the third uplink radio frequency signal having the first radio frequency band transmitted by the third antenna 507. Frequency mixing for the third uplink radio frequency signal having the first radio frequency band by using the second local frequency signal to receive and form an uplink radio frequency signal having the third radio frequency band Configured to transmit an uplink radio frequency signal having a third radio frequency band to the first multiplexer 505, and the third radio frequency band and the second radio frequency band do not overlap each other. .

Claims (14)

A distributed antenna system DAS comprising a near-end signal generation device, a passive DAS line, and a far-end transmission device, the near-end signal generation device comprising a signal source and a first signal generator, the far-end transmission device Has a first passive mixer and a first antenna;
The first signal generator is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer by using the passive DAS line;
The first passive mixer is configured to receive the first local frequency signal and a downlink radio frequency signal having a second radio frequency band;
The first passive mixer further has the second radio frequency band by using the first local frequency signal to form the first downlink radio frequency signal having a first radio frequency band. Configured to perform frequency mixing processing on the received downlink radio frequency signal, and then transmit the first downlink radio frequency signal having the first radio frequency band to the first antenna And
The first antenna is configured to transmit the received first downlink radio frequency signal having the first radio frequency band;
DAS. The near-end signal generating device further includes a first mixer and a multiplexer; and the far-end transmission device further includes the duplexer;
The first mixer is configured to receive the first downlink radio frequency signal having the first radio frequency band transmitted by the signal source;
The first mixer further performs frequency mixing processing on the first downlink radio frequency signal by using the first local frequency signal generated by the first signal generator, and frequency mixing Transmitting the downlink radio frequency signal having the second radio frequency band, which is generated later, to the multiplexer, or
Performing a frequency mixing process on the first downlink radio frequency signal by using a local frequency signal generated by the first mixer and having the second radio frequency band generated after frequency mixing; Configured to transmit the downlink radio frequency signal to the multiplexer;
The first signal generator is specifically configured to transmit the first local frequency signal to the multiplexer,
The multiplexer receives the downlink radio frequency signal having the second radio frequency band and the first local frequency signal, and forms the second downlink radio frequency signal to form a combined downlink radio frequency signal. By combining the received downlink radio frequency signal having the radio frequency band and the received first local frequency signal, and then using the passive DAS line, the combined down Configured to transmit a link radio frequency signal to the duplexer;
The duplexer is received to receive the combined downlink radio frequency signal and obtain the downlink radio frequency signal having the second radio frequency band and the first local frequency signal. Separating the signals included in the combined downlink radio frequency signal, and then combining the first radio frequency signal having the second radio frequency band and the first local frequency signal with the first passive mixing. Configured to transmit to
The first passive mixer receives the first local frequency signal and the downlink radio frequency signal having the second radio frequency band, and specifically, the first passive mixer includes the first passive mixer. Receiving a local frequency signal and the downlink radio frequency signal having the second radio frequency band transmitted by the duplexer;
The DAS according to claim 1. The far-end transmission device further comprises a second antenna;
The multiplexer further receives a second downlink radio frequency signal having the first radio frequency band transmitted by the signal source, and transmits the second downlink radio frequency signal to the combined downlink radio. Is configured to multiplex into a frequency signal and to transmit a downlink radio frequency signal obtained after multiplexing to the duplexer;
The duplexer further obtains the second downlink radio frequency signal having the first radio frequency band, and then obtains the second downlink radio frequency signal having the first radio frequency band to the second Configured to transmit to the antenna,
The second antenna is configured to transmit the received second downlink radio frequency signal having the first radio frequency band;
The DAS according to claim 2. The near-end signal generation device further comprises a second signal generator and a second mixer; the far-end transmission device further comprises a second passive mixer and a third antenna;
The second signal generator is configured to generate a second local frequency signal and transmit the second local frequency signal to the multiplexer;
The second mixer is configured to receive a third downlink radio frequency signal having the first radio frequency band transmitted by the signal source;
The second mixer is further configured to receive the second local frequency signal transmitted by the second signal generator and to form a downlink radio frequency signal having a third radio frequency band. Performing a frequency mixing process on the third downlink radio frequency signal having the first radio frequency band by using a frequency signal, and then the downlink radio frequency having the third radio frequency band Send a signal to the multiplexer, or
The third downlink radio having the first radio frequency band by using a local frequency signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band. Configured to perform frequency mixing processing on a frequency signal, and then transmit the downlink radio frequency signal having the third radio frequency band to the multiplexer, the third radio frequency band and the The first radio frequency band does not overlap each other,
The multiplexer further includes the downlink radio frequency signal having the third radio frequency band transmitted by the second mixer, and the second local frequency signal transmitted by the second signal generator. And combining the received downlink radio frequency signal having the third radio frequency band and the received second local frequency signal into the combined downlink radio frequency signal. , Configured to transmit a downlink radio frequency signal obtained after multiplexing to the duplexer;
The duplexer further acquires the downlink radio frequency signal having the third radio frequency band and the second local frequency signal, and then the downlink radio frequency signal having the third radio frequency band. And the second local frequency signal is transmitted to the second passive mixer,
The second passive mixer has the third radio frequency band by using the second local frequency signal to form the third downlink radio frequency signal having the first radio frequency band. Performing frequency mixing processing on the downlink radio frequency signal, and then transmitting the third downlink radio frequency signal having the first radio frequency band to the third antenna;
The third antenna is configured to transmit the received third downlink radio frequency signal having the first radio frequency band;
The DAS according to claim 2 or 3. A distributed antenna system DAS comprising a near-end signal receiving device, a passive DAS line, and a far-end receiving device, the near-end signal receiving device comprising a signal destination, a first signal generator, and a first mixing And the far-end receiving device has a first passive mixer and a first antenna,
The first signal generator is configured to generate a first local frequency signal and transmit the first local frequency signal to the first passive mixer by using the passive DAS line;
The first antenna receives a first uplink radio frequency signal having a first radio frequency band and transmits the first uplink radio frequency signal having the first radio frequency band to the first passive mixer. Configured as
The first passive mixer receives the first local frequency signal and uses the received first local frequency signal to form an uplink radio frequency signal having a second radio frequency band. Performing a frequency mixing process on the first uplink radio frequency signal having the first radio frequency band and then using the passive DAS line to thereby provide the uplink having the second radio frequency band. Configured to transmit a link radio frequency signal to the first mixer;
The first mixer is configured to receive the uplink radio frequency signal having the second radio frequency band;
The first mixer further uses the first local frequency signal generated by the first signal generator to form the first uplink radio frequency signal having the first radio frequency band. To perform a frequency mixing process on the received uplink radio frequency signal having the second radio frequency band, and then the first uplink radio frequency signal having the first radio frequency band. To the signal destination or to use the local frequency signal generated by the first mixer to form the first uplink radio frequency signal having the first radio frequency band To perform a frequency mixing process on the received uplink radio frequency signal having the second radio frequency band, and then to the first radio It constituted the first uplink radio frequency signals having a wave number band to send to the signal destination,
DAS. The far-end receiving device further includes a second antenna and a first multiplexer; and the near-end signal receiving device further includes a second duplexer;
The second antenna receives a second uplink radio frequency signal having the first radio frequency band and transmits the second uplink radio frequency signal having the first radio frequency band to the first multiplexer. Configured to
The first passive mixer is specifically configured to transmit the uplink radio frequency signal having the second radio frequency band to the first multiplexer,
The first multiplexer is transmitted by the second antenna, the second uplink radio frequency signal having the first radio frequency band, and the second radio transmitted by the first passive mixer. Receiving the uplink radio frequency signal having a frequency band and forming the combined uplink radio frequency signal, the second uplink radio frequency signal having the first radio frequency band, and the first Performing a multiplexing process on the uplink radio frequency signal having two radio frequency bands, and then using the passive DAS line to convert the combined uplink radio frequency signal to the second demultiplexing The first radio frequency band and the second radio frequency band do not overlap each other,
The second duplexer receives the combined uplink radio frequency signal, obtains the second uplink radio frequency signal having the first radio frequency band, and the second radio frequency; Separating the signal in the received combined uplink radio frequency signal to obtain the uplink radio frequency signal having a band, and then the second uplink having the first radio frequency band Configured to transmit a radio frequency signal to the signal destination and to transmit the uplink radio frequency signal having the second radio frequency band to the first mixer;
The first mixer is specifically configured to receive the uplink radio frequency signal having the second radio frequency band transmitted by the second duplexer.
The DAS according to claim 5. The near-end signal receiving device further includes a second signal generator, a second multiplexer, and a second mixer, and the far-end receiving device further includes a third antenna and a second passive mixer. And a first duplexer, wherein the second signal generator is configured to generate a second local frequency signal and transmit the second local frequency signal to the second multiplexer,
The first signal generator is specifically configured to transmit the first local frequency signal to the second multiplexer,
The second multiplexer receives the first local frequency signal transmitted by the first signal generator and the second local frequency signal transmitted by the second signal generator. Performing a multiplexing process on the first local frequency signal and the second local frequency signal to form a wave signal, and then using the passive DAS line, Is transmitted to the first duplexer,
The first duplexer receives the first combined signal, acquires the first local frequency signal, and acquires the second local frequency signal, the first combined signal. Is configured to transmit the first local frequency signal to the first passive mixer and to transmit the second local frequency signal to the second passive mixer;
The first passive mixer is specifically configured to receive the first local frequency signal transmitted by the first duplexer;
The third antenna receives a third uplink radio frequency signal having the first radio frequency band and transmits the third uplink radio frequency signal having the first radio frequency band to the second passive mixer. Configured to
The second passive mixer is configured to transmit the second local frequency signal transmitted by the first duplexer and the third uplink radio frequency having the first radio frequency band transmitted by the third antenna. The third uplink radio having the first radio frequency band by using the second local frequency signal to form an uplink radio frequency signal having a third radio frequency band Configured to perform frequency mixing processing on a frequency signal, and then transmit the uplink radio frequency signal having the third radio frequency band to the first multiplexer, the third radio frequency band And the second radio frequency band does not overlap each other,
The first multiplexer further receives the uplink radio frequency signal having the third radio frequency band transmitted by the second passive mixer, and the uplink radio having the third radio frequency band. A frequency signal is multiplexed into the combined uplink radio frequency signal, and an uplink radio frequency signal acquired after being combined with the second demultiplexer is transmitted by using the passive DAS line. Configured to
The second demultiplexer further obtains the uplink radio frequency signal having the third radio frequency band, and then the uplink radio frequency signal having the third radio frequency band to the second mixer. Configured to send to
The second mixer is configured to receive the uplink radio frequency signal having the third radio frequency band transmitted by the second duplexer;
The second mixer further uses the second local frequency signal generated by the second signal generator to form the third uplink radio frequency signal having the first radio frequency band. To perform a frequency mixing process on the uplink radio frequency signal having the third radio frequency band, and then transmitting the third uplink radio frequency signal having the first radio frequency band to the signal transmission destination. To send to or
The uphaving third radio frequency band by using a local frequency signal generated by the second mixer to form the third uplink radio frequency signal having the first radio frequency band. Configured to perform frequency mixing processing on a link radio frequency signal, and then transmit the third uplink radio frequency signal having the first radio frequency band to the signal destination;
The DAS according to claim 5 or 6. A signal transmission method performed by a distributed antenna system DAS, wherein the DAS comprises a near-end signal generation device, a passive DAS line, and a far-end transmission device, the near-end signal generation device comprising: a signal source; A first signal generator, the far-end transmission device having a first passive mixer and a first antenna;
The method
The first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using the passive DAS line;
The first passive mixer receives the first local frequency signal and a downlink radio frequency signal having a second radio frequency band;
The first passive mixer has the second radio frequency band by using the first local frequency signal to form the first downlink radio frequency signal having a first radio frequency band; Performing a frequency mixing process on the received downlink radio frequency signal, and then transmitting the first downlink radio frequency signal having the first radio frequency band to the first antenna;
Transmitting the received first downlink radio frequency signal, wherein the first antenna has the first radio frequency band. The near-end signal generating device further includes a first mixer and a multiplexer; and the far-end transmission device further includes a duplexer;
Specifically, the step of the first signal generator transmitting the first local frequency signal to the first passive mixer comprises:
The first signal generator transmits the first local frequency signal to the multiplexer, and the multiplexer transmits the first local frequency signal to the first passive mixer;
Prior to the step in which the first passive mixer receives a downlink radio frequency signal having a second radio frequency band, the method further comprises:
The first mixer receiving the first downlink radio frequency signal having the first radio frequency band transmitted by the signal source;
The first mixer performs a frequency mixing process on the first downlink radio frequency signal by using the first local frequency signal generated by the first signal generator, and after the frequency mixing Transmitting the downlink radio frequency signal having the generated second radio frequency band to the multiplexer, or
A frequency mixing process is performed on the first downlink radio frequency signal by using a local frequency signal generated by the first mixer, and the second radio frequency band generated after the frequency mixing is obtained. Transmitting the downlink radio frequency signal to the multiplexer;
The multiplexer receives the downlink radio frequency signal having the second radio frequency band and the first local frequency signal to form the combined downlink radio frequency signal, the second radio frequency signal. By combining the received downlink radio frequency signal having the radio frequency band and the received first local frequency signal, and then using the passive DAS line, the combined down Transmitting a link radio frequency signal to the duplexer;
The duplexer is received to receive the combined downlink radio frequency signal and obtain the downlink radio frequency signal having the second radio frequency band and the first local frequency signal. Separating the signal included in the combined downlink radio frequency signal; and then, the downlink radio frequency signal having the second radio frequency band and the first local frequency signal are converted to the first passive frequency signal. Transmitting to the mixer, and
The step of the first passive mixer receiving the first local frequency signal and a downlink radio frequency signal having a second radio frequency band, specifically, the first passive mixer comprises the Receiving the first local frequency signal and the downlink radio frequency signal having the second radio frequency band transmitted by a duplexer;
The signal transmission method according to claim 8. The far end transmission device further comprises a second antenna, and the method further comprises:
The multiplexer receives a second downlink radio frequency signal having the first radio frequency band transmitted by the signal source, and transmits the second downlink radio frequency signal to the combined downlink radio frequency. Combining into a signal and transmitting a downlink radio frequency signal obtained after the combination to the duplexer;
The duplexer acquires the second downlink radio frequency signal having the first radio frequency band, and then transmits the second downlink radio frequency signal having the first radio frequency band to the second antenna. Sending to
The signal transmission method according to claim 9, further comprising: the second antenna transmitting the received second downlink radio frequency signal having the first radio frequency band. The near-end signal generation device further comprises a second signal generator and a second mixer; the far-end transmission device further comprises a second passive mixer and a third antenna;
The method further comprises:
The second signal generator generates a second local frequency signal and transmits the second local frequency signal to the multiplexer;
The second mixer receiving a third downlink radio frequency signal having the first radio frequency band transmitted by the signal source;
The second mixer receives the second local frequency signal transmitted by the second signal generator and forms the second radio frequency signal having a third radio frequency band to form a downlink radio frequency signal. Performing a frequency mixing process on the third downlink radio frequency signal having the first radio frequency band by using a signal, and then the downlink radio frequency signal having the third radio frequency band To the multiplexer, or
The third downlink radio having the first radio frequency band by using a local frequency signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band. Performing frequency mixing processing on the frequency signal, and then transmitting the downlink radio frequency signal having the third radio frequency band to the multiplexer, the third radio frequency band and the The first radio frequency bands do not overlap each other, and
The multiplexer transmits the downlink radio frequency signal having the third radio frequency band transmitted by the second mixer and the second local frequency signal transmitted by the second signal generator. Receiving and combining the received downlink radio frequency signal having the third radio frequency band and the received second local frequency signal into the combined downlink radio frequency signal; Transmitting a downlink radio frequency signal obtained after multiplexing to the duplexer;
The duplexer acquires the downlink radio frequency signal having the third radio frequency band and the second local frequency signal, and then the downlink radio frequency signal having the third radio frequency band; Transmitting the second local frequency signal to the second passive mixer;
The second passive mixer has the third radio frequency band by using the second local frequency signal to form the third downlink radio frequency signal having the first radio frequency band. Performing frequency mixing processing on the downlink radio frequency signal, and then transmitting the third downlink radio frequency signal having the first radio frequency band to the third antenna;
11. The signal transmission method according to claim 9, wherein the third antenna transmits the received third downlink radio frequency signal having the first radio frequency band. A signal transmission method executed by a distributed antenna system DAS, wherein the DAS comprises a near-end signal receiving device, a passive DAS line, and a far-end receiving device, wherein the near-end signal receiving device is a signal destination. , A first signal generator, and a first mixer, wherein the far-end receiving device comprises a first passive mixer and a first antenna, the method comprising:
The first signal generator generates a first local frequency signal and transmits the first local frequency signal to the first passive mixer by using the passive DAS line;
The first antenna receives a first uplink radio frequency signal having a first radio frequency band and transmits the first uplink radio frequency signal having the first radio frequency band to the first passive mixer. Stages,
The first passive mixer receives the first local frequency signal and uses the received first local frequency signal to form an uplink radio frequency signal having a second radio frequency band; Performing a frequency mixing process on the first uplink radio frequency signal having the first radio frequency band and then using the passive DAS line to thereby provide the uplink having the second radio frequency band. Transmitting a link radio frequency signal to the first mixer;
The first mixer receives the uplink radio frequency signal having the second radio frequency band;
The first mixer uses the first local frequency signal generated by the first signal generator to form the first uplink radio frequency signal having the first radio frequency band; A frequency mixing process is performed on the received uplink radio frequency signal having the second radio frequency band, and then the first uplink radio frequency signal having the first radio frequency band is Send to the signal destination, or
Receiving the second radio frequency band by using a local frequency signal generated by the first mixer to form the first uplink radio frequency signal having the first radio frequency band Performing a frequency mixing process on the uplink radio frequency signal generated, and then transmitting the first uplink radio frequency signal having the first radio frequency band to the signal destination. Transmission method. The far-end receiving device further includes a second antenna and a first multiplexer; and the near-end signal receiving device further includes a second duplexer;
The step of the first passive mixer transmitting the uplink radio frequency signal having the second radio frequency band to the first mixer, specifically, the first passive mixer includes the first passive mixer. Transmitting the uplink radio frequency signal having two radio frequency bands to the first multiplexer;
The method further comprises:
The second antenna receives a second uplink radio frequency signal having the first radio frequency band and transmits the second uplink radio frequency signal having the first radio frequency band to the first multiplexer. And the stage of
The first radio is transmitted by the second antenna, the second uplink radio frequency signal having the first radio frequency band, and the second radio transmitted by the first passive mixer. Receiving the uplink radio frequency signal having a frequency band and forming the combined uplink radio frequency signal, the second uplink radio frequency signal having the first radio frequency band, and the first Performing a multiplexing process on the uplink radio frequency signal having two radio frequency bands, and then using the passive DAS line to convert the combined uplink radio frequency signal to the second demultiplexing Transmitting to a receiver, wherein the first radio frequency band and the second radio frequency band do not overlap each other;
The second duplexer receives the combined uplink radio frequency signal and obtains the second uplink radio frequency signal having the first radio frequency band; and the second radio frequency Separating the signal in the received combined uplink radio frequency signal to obtain the uplink radio frequency signal having a band, and then the second uplink having the first radio frequency band Transmitting a radio frequency signal to the signal destination and transmitting the uplink radio frequency signal having a second radio frequency band to the first mixer;
With
The step in which the first mixer receives the uplink radio frequency signal having the second radio frequency band, specifically, the first mixer is transmitted by the second duplexer. Receiving the uplink radio frequency signal having the second radio frequency band,
The signal transmission method according to claim 12. The near-end signal receiving device further includes a second signal generator, a second multiplexer, and a second mixer, and the far-end receiving device further includes a third antenna and a second passive mixer. And a first duplexer,
In the step of transmitting the first local frequency signal by the first signal generator, specifically, the first signal generator transmits the first local frequency signal to the second multiplexer. Has steps,
The method further comprises:
The second signal generator generates a second local frequency signal and transmits the second local frequency signal to the second multiplexer;
The second multiplexer receives the first local frequency signal transmitted by the first signal generator and the second local frequency signal transmitted by the second signal generator; Performing a multiplexing process on the first local frequency signal and the second local frequency signal to form a wave signal, and then using the passive DAS line, Transmitting to the first duplexer;
The first duplexer receives the first combined signal, acquires the first local frequency signal, and acquires the second local frequency signal, the first combined signal. Separating the signal at, then transmitting the first local frequency signal to the first passive mixer and transmitting the second local frequency signal to the second passive mixer;
The third antenna receives a third uplink radio frequency signal having the first radio frequency band and transmits the third uplink radio frequency signal having the first radio frequency band to the second passive mixer. And the stage of
The second uplink radio frequency having the first radio frequency band, wherein the second passive mixer is transmitted by the second antenna and the second local frequency signal transmitted by the first duplexer. The third uplink radio having the first radio frequency band by using the second local frequency signal to form an uplink radio frequency signal having a third radio frequency band Performing a frequency mixing process on a frequency signal, and then transmitting the uplink radio frequency signal having the third radio frequency band to the first multiplexer, the third radio frequency band And the second radio frequency bands do not overlap each other,
The first multiplexer receives the uplink radio frequency signal having the third radio frequency band, transmitted by the second passive mixer, and the uplink radio frequency having the third radio frequency band. A signal is multiplexed into the combined uplink radio frequency signal, and the uplink radio frequency signal obtained after multiplexing is transmitted to the second duplexer by using the passive DAS line. Stages,
The second duplexer obtains the uplink radio frequency signal having the third radio frequency band, and then the uplink radio frequency signal having the third radio frequency band to the second mixer. Sending, and
The second mixer receives the uplink radio frequency signal having the third radio frequency band transmitted by the second duplexer;
The second mixer uses the second local frequency signal generated by the second signal generator to form the third uplink radio frequency signal having the first radio frequency band; , Performing frequency mixing processing on the uplink radio frequency signal having the third radio frequency band, and then transferring the third uplink radio frequency signal having the first radio frequency band to the signal destination Send or
The uphaving third radio frequency band by using a local frequency signal generated by the second mixer to form the third uplink radio frequency signal having the first radio frequency band. Performing frequency mixing processing on a link radio frequency signal, and then transmitting the third uplink radio frequency signal having the first radio frequency band to the signal destination. The signal transmission method described.

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